Trimming mechanism for embroidering-machines.



No. 768,419. PAT'EN'EED AUG. 2a, 1904.

A W. B UWDEN. TRIMMING MBGHANISM F'R EMBRQIDBRING MACHINES.,

APPLIQATION FILED DEO. 1,.1902.

No MODEL.

UNITED A STATES Patented August 23, 1904.

PATENTy OFFICE.

WILLIAM BOWDEN, OF MANCHESTER, ENGLAND.

SPECIFICATION forming part of Letters '.atent No. 768,419, dated August 23, 1904.-

Application filed December 1, 1902. Serial No. 133,362. (No model.) i

' lowing is a specification.

l same class.

This invention relates to improvements in embroidery-sewing machines which are especially applicable to the machines of the well-known Bonnaz type, but which are also applicable to other sewing-machines of the Its objects are to insure the applied cloth to be cut much `more smoothly than at present is possible and much more closely to the line of stitches which unite the two cloths.

, The characteristic featureof the present improvements is ascissors-like cutting device, together with means for operating, controlling, and 'adjusting that device. The accompanying drawings illustrate the improvements as embodied in a Bonnaz embroidery-sewing machine, and it will be understood that they may be similarly embodied in other machines of the same class.

In the drawings, Figure l shows a side elevation; Fig. 2, a front elevation; Fig. 3, a cross-section taken along the line A A, Fig. l; Fig. 4, a cross-section along the line B B, Fig'. 1; and Figs. 5 and 6, an elevation and an inverted plan, respectively, of a modified form of nipple. y

The nipple a is removably fixed upon the nipple-tube a', which is vertically reciprocated independent of the needle-bar. The needle-bar tube and the nipple-tube are both of the usual construction and are reciprocated by the existing known devices. The lower end of the nipple, however, has a materiallymodified construction, one part of it being cut away to form a vertical plane b as close as is found practicable with the vertical needle-bore in its center. On the nipple-tube I mount the sleeve f, which has a groove around its upper circumference, which is engaged by curved arms 7c integral with the curved plate 7c, attached by a set-screw c' and an inclined slot j to the bearing g. On the sleeve f there `through the required angle.

.carrier is cranked under the nipple, where it is provided with a flat part c, corresponding `with the nipple fiat b. The lower end of this fiattened part has the lower member of the cuttingdevice attached to it or formed from its substance. The member is formed by making a deep lateral notch in the lower part of c, thus leaving an inclined upper edge to the part e, which edge is made and kept sharp. This part is also curved, as shown by Fig. 3, c', and ends in a sharp point. This curved part crosses the path of the needle s and prevents cloth which has been cut .from falling 01T when angles and sharp turns are being produced in the work. Its point also facilitates the introduction of the member through the upper layer of the cloth. This is effected by causing the point e to penetrate the applied cloth and then giving it a part of a turn. The upper member of the cutting device is a thin steel plate with an inclined and sharpened loweredge,'the plate being removably secured upon the nipple flat 'b by pins or other equivalent devices. Because of the contact between the parts and c and because b can slide freely upon the part o the anguv lar motion of the nipple, but not its vertical motion, is communicated through the carrier Z to the blade e, and it inevitably follows that the cutting parts of the blades b and e are al- Ways in close contact and that a scissors-like action results from the relative motion of the part b.

Below the set-pin in the inclined slot jthere is xed in the curved plate lo, before described, a small handle or projection m, whereby the said plate can be turned through a moderately wide angle. If it be so turned, the inclined slot rides up or down the set-pin ,'and the curved plate is thereby raised or lowered, the sleeve and the connected lower member of the cutting device necessarily participating in the vertical movement. When it is desired, therefore, to raise or lower the cutting member e, it is necessary only to move the handle m A spring n is forced on the curved plate by the head of the set-pin c' in order to produce resistance to the IOC movement of the plate and to prevent its accidental displacement.

As only that part of the lower end of the nipple which extends from the circumference to just beyond the needle-bore is required for ixing thereto the blade about three-fourths instead of nearly one-half ofl it may be cut away, as shown by Fig. 3, or, if preferred, it may be shaped as'shown by Fig. 6.

Since by these improvements the cutting is eli'ected much more closely than at present to the stitches, the raveling out of the warp and weft ends in the applied cloth edges, which produces a ragged untidy appearance, is entirely avoided. The sharp upper edge of the cutting-blade e being inclined, as shown by Fig. l, and being between the upper applied cloth and the lower foundation-cloth, the motion of the stretched applied cloth up the edge of the blade has in itself a shearing action on the applied cloth which in some casessufiiees to sever it without the aid of the other blade. In like manner if the` part c be blunt or be substituted by an equivalent part which will locally lift the applied cloth the inclined sharp lower edge of the blade Z) will vexert a shearing action, which also in some cases suffices to sever the cloth. It is to be understood, therefore, that I do not limit myself to the simultaneous use of the two cutting-blades, although in the majority of cases it is necessary or advantageous to employ both.

The parts of the machine illustrated by the drawings and not hereinbefore referred to are parts of existing machines of the Bonnaz type-that is to say, the needle-bar 0, the needle-bar tube p concentric with the needlebar, the feeder g, provided with an indiarubber ring q', and the slide r for moving the nipple-tube a upon and independently of the vertical motion of the needle-bar tube p. The

nipple-tube a takes part in the angular motion only of the needle-bar tube.

As hereinbefore described and as illustrated by the drawings, the carrier and the fixed blade are made in a single piece. 'Ihis is not necessary, and to avoid cost in case of brealv age of the knife the latter may be constructed separately and be removably attached to the carrier in the same manner as the blade e is attached to the flat of the nipple What I claim as my invention, and desire to secure by Letters Patent, is-

1. In a sewing machine of the class dcscribed, the combination of a needle-bar, a nipple having a flat vertical side close up to the needle-bar, a cutting-blade directly attached to the fiat side of the nipple, a lower knife having a lateral extension crossing the path of the work, a carrier to which said knife is attached, means for raising and lowering the carrier and means for reciprocating` the needle-bar, said knives being adapted to produce a shearing cut.

2. In a sewing-machine of the class described, the combination of a nipple-tube, a sleeve thereon having a groove formed around its upper part, a curved plate fitted and capable of manipulation on the nipple-tube bearing and having an inclined slot therethrough, a set-pin fixed on the nipple-tube bearing` and extending through the inclined slot, a curved part integral with the curved plate and engaging with the circulargroove on the sleeve, for the purpose of permitting, al'igular motion and obtaining vertical movement of the sleeve, an upper cutting-blade attached to the nipple close to the needle-bore, a lower cutting-blade, a loose sleeve on the nipple-tube and a carrier by which said cutting-blade is attached to the loose sleeve.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WILLIAM BOVVDEN.

Witnesses:

WILLIAM EDWIN HnYs, GEORGE MoHL. 

